JPS59190630A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To perform highly accurate measurement of a body temperature at an early time, by predicting the converging body temperature at a plurality of specified times after the different time periods from the start of the measurement, displaying the result, and also displaying the range of errors at each specified time. CONSTITUTION:The output of a sensor 1 such as a thermistor for detecting a body temperature is converted into a digital signal by an A/D converter 2 from the analog signal. The detected temperature signal is received by a CPU3. A converting temperaure Ts is predicted at every specified time in accordance with a program stored in an ROM4, and the control for determining the range of errors is performed. The range of errors in the predicted converging temperature is displayed by a body temperature display 6- I .

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to an electronic thermometer, and particularly to an electronic thermometer that can measure the body temperature of a subject at an early stage after starting measurement.

(b) Prior art and its problems Generally, in electronic thermometers, the detection part is inserted under the armpit or under the tongue during measurement, but it usually takes time for the detection part to reach a state of thermal equilibrium with body temperature. .

Conventional electronic thermometers either display the temperature as it changes from a changing state to a stable state, or predict and display the convergence body temperature only once after a certain period of time has elapsed after the start of measurement. However, if the state of change in body temperature is displayed as is, it is not possible to know the convergence temperature value early.
Even if you can get a tentative body temperature early by predicting body temperature only once, you cannot know the convergence temperature at any given time.
It is not possible to take detailed body temperature measurements. In other words, if the body temperature is predicted early, the convergent temperature value will contain a large error, and conversely, if the body temperature is predicted a relatively long time after the start of measurement, one body temperature will be close to the actual value! ll accuracy is improved, but the meaning of early prediction is diminished. Moreover, there is a drawback that only by displaying the predicted convergence temperature value, the measurer cannot visually know how much error there is.

(c) Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional electronic thermometer, and to obtain an electronic thermometer that can quickly determine convergent body temperature and measure convergent body temperature more accurately over a period of 9 hours. Provide a thermometer.

B) Structure and Effect of the Invention In order to achieve the above object, the electronic thermometer of the present invention stores in a storage means the error range of the predicted convergence value corresponding to each predetermined time a plurality of times at different times after the start of measurement. , At each predetermined time of multiple measurements after the start of measurement, the predicted body temperature at that time is displayed on the display, and the error range stored in the recording/display means corresponding to that time is displayed on the body temperature. I am trying to display it on another display device different from the display device.

According to the electronic thermometer of the present invention, since the convergence body temperature is predicted and displayed at multiple predetermined times at different times after the start of measurement, and the error range at each predetermined time is also displayed, it is possible to measure body temperature at an early stage. Of course, what can be done is that it is possible to predict the convergence body temperature with high precision, that is, with a high degree of accuracy, as the hour progresses.

(e) Description of examples Hereinafter, the present invention will be explained in more detail with reference to Examples.

FIG. 1 is a block diagram of an electronic thermometer in which the present invention is implemented. In the figure, 1 is a sensor such as a thermistor that detects body temperature, 2 is an A/D converter that converts the output from sensor 1 from an analog signal to a digital signal, and 6 is a C
The PU receives the detected temperature signal from the A/D converter 2, and according to the program stored in the ROM 4, predicts the convergence temperature Ts at predetermined intervals and performs control to determine the error range. . 5 is a RAM that stores various data during the control process. 6 is a body temperature display that displays the predicted convergent body temperature, and 7 is an error display that displays the error range of the convergent body temperature displayed on body temperature display B. A liquid crystal 2 is used as a display body for these body temperature display 6 and error display 7.
light emitting diode.

A well-known device such as a fluorescent display tube is used. 8 is a start switch for instructing the start of measurement.

In addition, as shown in FIG. 4 in the above 'RA M 5.

The error table, ie, the elapsed time since the start of measurement, is reached. A prediction error range is correspondingly stored. For example, the figure shows an error of ±05°C after 20 seconds or more, ±0.4°C1 after 40 seconds, and ±01°C after 10 minutes. , the error values for each of these elapsed times are determined experimentally and stored in advance. However, the prediction error range is different for each prediction.
It may be calculated and temporarily stored.

Next, the operation of the electronic thermometer of the above embodiment will be explained with reference to the flowchart shown in FIG.

When the start switch 8 is turned on and the operation is started, a timer is started in step ST1.

This timer is used to check the elapsed time after the start of measurement, and is built into the CPU 6, although it is not particularly shown. Next, in step ST2, the predicted body temperature Ts
Calculate. An example of a method for calculating this predicted body temperature Ts will be described later. Next, read the timer to obtain the time of predicted body temperature calculation (Si2), and refer to the error table shown in Fig. 4 to calculate the error △ at that time.
Read from AM5, T of predicted body temperature data and error data
s±ΔT is obtained (Si4). These data are then displayed on each display (Si5). In other words, predicted body temperature Ts
is displayed on body temperature display B, and error data ΔT is displayed on error display 7. Then, it is determined whether the measurement is completed or not (5T7), and if the start switch 8 is not turned off, the determination returns to step ST2 with a 1 determination No, and as time elapses, step ST2. ...Repeat the process of step ST6,
Continuously calculate the predicted body temperature and extract the error corresponding to the calculation time.

Each time, the predicted body temperature and its error range are displayed in pairs.

For example, if the predicted body temperature after 1 minute has passed is 66.4, the error range after 1 minute is ±0.6, so as shown in Figure 2, 66.4 is displayed on the body temperature display. , ±0.6 is displayed on the error display 7. Therefore, the measurer who looks at the display after one minute has passed can obtain a body temperature of 66.4 with an error range of ±06. When you want to perform even more precise measurements.

The measurer only has to continue the measurement. For example, if the measurement is continued until 10 minutes have passed and 366 is displayed on body temperature display 1, the error display 7 will be displayed as shown in Figure 4.
Since 0.1 is displayed, the person measuring the temperature can know that the body temperature is 66.6 with an error range of ±01, and can measure the body temperature with higher reliability even after one minute has elapsed. In this way, this electronic thermometer allows you to know the convergence body temperature and its error range from an early stage until a certain amount of time has passed. Therefore, the measurer can always take the error range into consideration at any time, and therefore can measure body temperature with accuracy that meets the purpose.

In the above embodiment, the error display 7 displays the plus and minus error ranges, that is, ΔT, but instead of this display, two error displays are provided as shown in FIG. Temperature vessels 7a and 7b are provided, and one of them has a temperature Ts+ΔT (36, 7) including an upper limit error.

Body temperature Ts-i-△T (36, 1) including the lower limit error on the other side
may be displayed. If you display it like this.

The person taking the measurement can intuitively know approximately in what range the convergent body temperature falls.

Next, the predicted body temperature T in step ST2 shown in FIG.
A specific example of the calculation method No. 8 will be explained with reference to the flowchart shown in FIG. The method of calculating the predicted body temperature Ts shown here is:
There is a linear relationship between the logarithm value TL of the time derivative of the measured body temperature T and time.

Focusing on the fact that it can be expressed as T L = A - τ't, the constants A and τ' are determined by the one-regression method, and the convergence body temperature Ts is predicted from these constants.This principle is adopted. The inventors of this application have created an electronic thermometer and have already filed an application.

When entering the predicted body temperature Ts calculation routine, first step ST
In step ST21, the initial temperature l1iiTo is stored, and then in step ST22, it is determined whether or not the sample time has arrived, and when the sample time has arrived, the detected temperature T1 taken in via the A/D converter 2 is stored in the RAM 5. Store in (
ST23). Next, the time differential value dTi/ of the detected temperature T1
Calculate dt (5T24).

Furthermore, the logarithm value of this time differential value TL1 = log d
T1/dt is determined (ST25). And the calculated TL
1 and the current sample time t1i are stored in the RAM 5 (ST26). Next, it is determined whether the sample time number i has reached the preset n (5T27),
If the sampling time has not reached n, the process returns to step ST22, and steps 5T22.5T23. ....

5 Repeat the process of T26. Through this series of processing, each sample time t1. t2. ......, tn and the logarithm of the time differential value of the detected temperature for each sample time TL
1, TL2. ---.-, TLn is stored in RA%5.

When the number of sample times i reaches n, step ST2
7 becomes YES, and then the stored data t
11 t2. ”・＋ mon and TLl, TL2
,-.

Based on TLn, constants A and τ' are calculated by the two-regression method, ie, according to the following equation (ST 2B, 5T29), thereby identifying a characteristic curve unique to the subject.

Then, the convergence temperature Ts is calculated (ST30).

When the above-mentioned method of predicting the convergence temperature Ts is used, at each arbitrary time point. The error from the actual convergence temperature is smaller than the experimental result and the approximate value (see Figure 7), so 2
The temperature at each time is displayed as Ts±1△T1° or Ts-1△T1 to T8+1△T1. The error range for this time t may be calculated by calculating the average value in advance and storing it as an error table as shown in FIG. 4, but it may also be calculated each time using the above formula.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronic thermometer according to the present invention, FIG. 2 is a diagram showing a display example of the electronic thermometer, FIG. 6 is a diagram showing another display example of the electronic thermometer, and FIG. The figure shows the error table of the electronic thermometer, Figure 5 is the main flow diagram for explaining the operation of the electronic thermometer, Figure 6 is the flow diagram showing the predicted body temperature calculation routine, and Figure 7 is the diagram shown in Figure 6. FIG. 3 is a diagram showing the relationship between an arbitrary time source error 1ΔT1 when the convergence temperature Ts is predicted according to the flow shown in FIG. 1: Sensor, 2: A/D converter, 3: CPU
, 4: ROM, 5: RAM, 6: Body temperature display, 7: Error display, 8: Start switch. Patent applicant Tateishi Electric Co., Ltd. Agent ゛Ben'
Shigenobu Nakamura, Physician Vtt Figure 2 Figure 5 Procedural amendment (voluntary) 1 Indication of the case 1981 Patent application No. 065927 2 Title of the invention Electronic thermometer 6 Person making the amendment 4 Relationship with the precedent patent application Address 1o Hanazono Tsuchido-cho, Ukyo-ku, Kyoto City Name
(294) Tateishi Electric Co., Ltd. Representative Takao Tateishi 4th Agent (1) Amend line 9 from the 10th purchase of the statement. (2) In the second line from the bottom of page 10 of the specification, the phrase "in advance" should be amended to read "1 in advance."that's all

Claims (3)

[Claims] (1) In an electronic thermometer that predicts the convergence value of body temperature and displays it on a display at a predetermined time after the start of measurement. The error range of the predicted convergence value corresponding to each predetermined time a plurality of times after the start of the measurement is stored in a storage means, and the predicted body temperature at that time is stored at each predetermined time any number of times after the start of the measurement. An electronic thermometer characterized in that, in addition to displaying the error range on the display, an error range stored in the storage means corresponding to the time is also displayed on a display different from the body temperature display. (2) The electronic thermometer according to claim 1, wherein the other display is a single display that simultaneously displays plus and minus error ranges. (3) The electronic thermometer according to claim 1, wherein the other display device is two display devices that display an upper limit body temperature and a lower limit body temperature due to an error.